import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

public class ThreadDemo3 {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        FutureTask<Integer> futureTask = new FutureTask<>(new Callable<Integer>() {
            @Override
            public Integer call() throws Exception {
                int sum=0;
                for (int i = 0; i <= 1000 ; i++) {
                    sum+=i;
                }
                return sum;
            }
        });
        Thread t = new Thread(futureTask);
        t.start();
        System.out.println(futureTask.get());
    }
}
